Update dependencies from https://github.com/dotnet/winforms build 20211020.1 (#5549)

[main] Update dependencies from dotnet/winforms

eng/Version.Details.xml

 <?xml version="1.0" encoding="utf-8"?>
 <Dependencies>
   <ProductDependencies>
-    <Dependency Name="Microsoft.Private.Winforms" Version="7.0.0-alpha.1.21519.7">
+    <Dependency Name="Microsoft.Private.Winforms" Version="7.0.0-alpha.1.21520.1">
       <Uri>https://github.com/dotnet/winforms</Uri>
-      <Sha>2c41fee490ca524c50881e44ecd18b3532c55a90</Sha>
+      <Sha>6060f9e455cd95c9a1fe5139166830d57c25c4a1</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Dotnet.WinForms.ProjectTemplates" Version="7.0.0-alpha.1.21519.7">
+    <Dependency Name="Microsoft.Dotnet.WinForms.ProjectTemplates" Version="7.0.0-alpha.1.21520.1">
       <Uri>https://github.com/dotnet/winforms</Uri>
-      <Sha>2c41fee490ca524c50881e44ecd18b3532c55a90</Sha>
+      <Sha>6060f9e455cd95c9a1fe5139166830d57c25c4a1</Sha>
     </Dependency>
     <Dependency Name="System.CodeDom" Version="7.0.0-alpha.1.21519.1" CoherentParentDependency="Microsoft.Private.Winforms">
       <Uri>https://github.com/dotnet/runtime</Uri>

eng/Versions.props

@@ -9,7 +9,7 @@
   </PropertyGroup>
   <!-- NuGet Package Versions -->
   <PropertyGroup>
-    <MicrosoftPrivateWinformsVersion>7.0.0-alpha.1.21519.7</MicrosoftPrivateWinformsVersion>
+    <MicrosoftPrivateWinformsVersion>7.0.0-alpha.1.21520.1</MicrosoftPrivateWinformsVersion>
   </PropertyGroup>
   <!-- Packages that come from https://github.com/dotnet/coreclr -->
   <PropertyGroup>